I have met many people in my career that have been back stabbers and gossips. I just let them go about their business. In the end they have all been their own undoing and I am still here and going strong.
It never ceases to amaze me how people "remember" things that never happened. Listening to a lying A**hole wont get you the truth. Have the guts to just ask if it's so important that you know my business!